1 pkg. of fresh, lg. mushrooms
1 sm. onion
1/4 c. sour cream
1 tbsp. grated Parmesan
1/4 c. seasoned bread crumbs
2 tbsp. butter

Wash mushrooms and take off stems. Chop up stems in food processor, put in mixing bowl. Chop up onion and add to bowl. Add butter. Microwave 2 minutes on #7 or medium high -- stir and microwave 3 more minutes at same temperature. Mix in sour cream, Parmesan cheese and bread crumbs. Place in caps and microwave 7 minutes on #7 or medium high.